Malicious PDF — malware analysis report

Static analysis result for SHA-256 a006a54c7657e177…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 08:29:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2bf9460b5d010ef6924cd00065cf506 SHA-1: 945f5bc0e7574a0dd12d2d822cb5d972cab9fec6 SHA-256: a006a54c7657e177e54cb8706d010b3cb0007af19e1e18c278b17ec9c30967a1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/67183561877.pdf In PDF document text
    • http://aftp.bg/userfiles/file/widitezuwanofe.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e97223e223---buxitijatufetapuravufam.pdfIn PDF document text
    • http://xn--e42bt3l.net/upfile/files/89742477138.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/54710217609.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021091016113594.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/70363733980.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/nujujezunurugogonovaf.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/boxuselijonizugajuvilan.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090712504021.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/dopurogew.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/85839598999.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e2d39c3ce---datazatajigonujokuked.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/31581386074.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/volokem.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/58979360401.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/12857371222.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/1a550d1b08c34c80093e49fd4f865339/93501365367.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/30899859748.pdfIn PDF document text
    • https://texigo.tw/upfile/files/2021/09/23/7990540031.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/41998898257.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/iqv82s7i9sj4rtspicv49mhll5/rezulivomamomeri.pdfIn PDF document text
    • http://doo-san.com/userfiles/file/20210922172850.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name/files/3321236454.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6f592005e---ledobugezupizovirusu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=hitchhiker%27s+guide+to+the+galaxy+watch+online+123moviesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB300 14632 bytes
SHA-256: b3eec90cfe758a2841d6b08ccb5c8c2acb9d1a35a00096d3de98e47fe6130082
font_01_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 11744 bytes
SHA-256: ea806b938c9a540c5bb47d2127ddd003094b31ddfec6d44aefec0154a41ff1f7

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